Pesticide exposure assessment

Area of Science:

• Environmental Science
• Toxicology
• Risk Assessment

Background:

• Human exposure to pesticides can be unintended, accidental, or unavoidable.
• Risk Characterization offers a framework for assessing pesticide use risks.
• Exposure assessments for pesticides are not yet standardized.

Purpose of the Study:

• To present a tiered approach for estimating potential dermal exposure (PDE) and absorbed dose from pesticide use.
• To provide methods for assessing risks to pesticide handlers and harvesters.
• To inform regulatory and public risk characterization of pesticide applications.

Main Methods:

• Tier 1: Generic Database using passive dosimetry and skin washing for mixer/loader/applicator potential dermal exposure (PDE).
• Tier 2: Refined estimates using dermal absorption (DA), clothing protection, and PDE measurements under specific use conditions.
• Tier 3: Direct absorbed dose estimation via metabolic/kinetic data and biological monitoring.
• Harvester exposure estimation based on work tasks, dislodgeable foliar residue, and exposure duration.

Main Results:

• The study details a progressive, tiered system for exposure assessment, moving from generic to specific data.
• Established methods for estimating potential dermal exposure (PDE) for pesticide handlers and harvesters.
• Highlighted the need for reentry intervals for harvesters to mitigate exposure.

Conclusions:

• A structured, tiered approach enhances the accuracy of pesticide exposure assessments.
• Standardized exposure assessment methods are vital for effective risk characterization.
• Understanding dermal absorption and contact is key to managing pesticide risks for agricultural workers.